Aunt has one which I have setup for her. It's one of those you get what you paid for. As mentioned u can't find any information for it on google. Don't think you ever get any stock updates to newer versions of Android, unless you root it and put custom roms.
The preloaded apps I don't know where they even found them, just load proper Google Play store and get all the proper versions like adobe reader and so on. I found found the screen resolution a bit low and not as crispy and clear as the Samsung Tabs.
Did not find any major problems with it except it feels a tad slow, but not by much.
As for OP my aunt's tab had no problems with SMS, but can't remember doing anything weird to get it working.
Edit:
O yeah I think it has a dialer included, but you can't make voice calls or it does not support voice calls - I don't think tabs were meant for voice calls, but just mentioning.
O yeah another thing whatsapp is not supported on your device : (